Distribution of ammonium in minerals of metamorphic and granitic rocks

Details Distribution of ammonium in minerals of metamorphic and granitic rocks Distribution of ammonium in minerals of metamorphic and granitic rocks

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..983h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Issue 6, pp.983-988

Computer Science

12

Scientific paper

Sixty-nine analyses are given for NH 4 in minerals of metamorphic and granitic rocks mostly from the Ryoke belt, Japan. The distribution of NH 4 in coexisting minerals is quite systematic, suggesting that NH 4 is one of the stable geochemical components in high temperature processes. Biotite has the highest content of NH 4 , followed by muscovite, K-feldspar and plagioclase. Pure quartz is almost free from NH 4 . Calcic plagioclase contains less NH 4 than does sodic plagioclase. The partition coefficients D Pl / Bi , D Kf / Bi and D Kf / Bi are, on the average, 0.11, 0.38 and 0.43 respectively. The fractionation of NH 4 in these minerals is quite similar to that of Rb but much smaller than that of Cs. Distribution of NH 4 as well as those of Rb and Cs appears to be explained by its ionic radius and the shortest cation-O distances in alkali positions of minerals.

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